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                <h1 class="kratos-entry-title text-center">Vue3 图片预览放大镜组件(非插件)</h1>
            
            
            <ul class="kratos-post-meta text-center">
                <li><i class="fa fa-calendar"></i> 2021-07-26</li>
                <li><i class="fa fa-user"></i> 作者 cuishikang</li>
                <li>
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                        ~6.14K
                    
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            <div id="expire-alert" class="alert alert-warning hidden" role="alert">
                本文最后编辑于 <time datetime="1645266178550"></time> 前，其中的内容可能需要更新。
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            <hr />
            <p>::: tip 介绍<br>Vue3图片预览放大镜组件 具备展示和放大功能<br><br>:::</p>
<span id="more"></span>

<h2 id="Vue3图片预览放大镜组件-非插件"><a href="#Vue3图片预览放大镜组件-非插件" class="headerlink" title="Vue3图片预览放大镜组件(非插件)"></a>Vue3图片预览放大镜组件(非插件)</h2><p><img src="https://jinyanlong-1305883696.cos.ap-hongkong.myqcloud.com/dzDwfGm4CykQFHK.gif" alt="7563j-866jh"></p>
<p><a target="_blank" rel="noopener" href="https://gitee.com/liu_kaili/Vue_little_rabbit_fresh">图片预览放大镜组件使用项目</a></p>
<blockquote>
<p>目的：完成商品图片预览功能和切换 并且实现图片放大镜功能</p>
</blockquote>
<p>大致步骤：</p>
<ul>
<li>准备图片预览放大镜组件的样式和效果<ul>
<li>需要准备两个图片容器 一个用来预览原图 一个用来预览放大后的图片</li>
<li>需要准备一个遮盖图效果 用来控制预览放大效果</li>
</ul>
</li>
<li>Vue组件导入图片预览放大镜组件 配置图片数据</li>
</ul>
<blockquote>
<p>图片预览放大镜组件实现步骤</p>
</blockquote>
<ol>
<li>封装图片预览放大镜组件<ul>
<li>路径: <code>src/views/goods/components/goods-image.vue</code></li>
<li>首先准备大图容器和遮罩容器</li>
<li>然后使用<code>@vueuse/core</code>的<code>useMouseInElement</code>方法获取基于元素的偏移量(遮盖层移动数据)<ul>
<li>elementX表示相对元素左上角的横向偏移量 x轴</li>
<li>elementY表示相对元素左上角的纵向偏移量 y轴</li>
<li>isOutside是否在元素之外 在监控Dom元素外是true 在里面是false</li>
<li>target是监听的Dom元素</li>
</ul>
</li>
<li>计算出 遮罩容器定位与大容器背景定位  暴露出数据给模板使用(右侧大图移动数据) 实现放大效果</li>
<li><font color =#ff3040>图片预览放大镜组件参数</font><ul>
<li><code>:images</code>动态向图片预览放大镜组件 传递展示图片数据 (必填)</li>
</ul>
</li>
</ul>
</li>
</ol>
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class="line">152</span><br><span class="line">153</span><br></pre></td><td class="code"><pre><span class="line">&lt;template&gt;</span><br><span class="line">  &lt;div class=&quot;goods-image&quot;&gt;</span><br><span class="line">    &lt;!-- 右侧大图效果(放大镜的图) --&gt;</span><br><span class="line">    &lt;!-- 设置右侧图片地址 和 图片的平移 --&gt;</span><br><span class="line">    &lt;div v-show=&quot;isShow&quot; class=&quot;large&quot; :style=&#x27;[&#123;backgroundImage: `url($&#123;images[currIndex]&#125;)`&#125;,imgPostion]&#x27;&gt;&lt;/div&gt;</span><br><span class="line">    &lt;!-- 左侧的中图(预览图) --&gt;</span><br><span class="line">    &lt;div class=&quot;middle&quot; ref=&#x27;target&#x27;&gt;</span><br><span class="line">      &lt;img :src=&quot;images[currIndex]&quot; alt=&quot;&quot;&gt;</span><br><span class="line">      &lt;!-- 遮罩层(放大镜的遮罩层) --&gt;</span><br><span class="line">      &lt;!-- 动态控制遮罩层样式 实现根据鼠标移动 --&gt;</span><br><span class="line">      &lt;div class=&quot;layer&quot; :style=&#x27;layerPosition&#x27;&gt;&lt;/div&gt;</span><br><span class="line">    &lt;/div&gt;</span><br><span class="line">    &lt;ul class=&quot;small&quot;&gt;</span><br><span class="line">      &lt;!-- 右侧5张小图片(点击后切换相应的图片) --&gt;</span><br><span class="line">      &lt;li v-for=&quot;(img,i) in images&quot; :key=&quot;img&quot; :class=&quot;&#123;active:i===currIndex&#125;&quot;&gt;</span><br><span class="line">        &lt;img @mouseenter=&quot;currIndex=i&quot; :src=&quot;img&quot; alt=&quot;&quot;&gt;</span><br><span class="line">      &lt;/li&gt;</span><br><span class="line">    &lt;/ul&gt;</span><br><span class="line">  &lt;/div&gt;</span><br><span class="line">&lt;/template&gt;</span><br><span class="line">&lt;script&gt;</span><br><span class="line">import &#123; ref, watch, reactive &#125; from &#x27;vue&#x27;</span><br><span class="line">// 导入VueUse里面 监听鼠标在元素的坐标</span><br><span class="line">import &#123; useMouseInElement &#125; from &#x27;@vueuse/core&#x27;</span><br><span class="line">export default &#123;</span><br><span class="line">  name: &#x27;GoodsImage&#x27;,</span><br><span class="line">  props: &#123;</span><br><span class="line">    // 接收传来的图片数据</span><br><span class="line">    images: &#123;</span><br><span class="line">      type: Array,</span><br><span class="line">      default: () =&gt; []</span><br><span class="line">    &#125;</span><br><span class="line">  &#125;,</span><br><span class="line">  setup (props) &#123;</span><br><span class="line">    // 设置图片切换的状态位</span><br><span class="line">    const currIndex = ref(0)</span><br><span class="line">    // 设置监听的Dom元素</span><br><span class="line">    const target = ref(null)</span><br><span class="line">    // 控制右侧大图的显示与隐藏</span><br><span class="line">    const isShow = ref(false)</span><br><span class="line">    // 使用VueUse里面 监听鼠标在元素的坐标</span><br><span class="line">    // elementX表示相对元素左上角的横向偏移量 x轴</span><br><span class="line">    // elementY表示相对元素左上角的纵向偏移量 y轴</span><br><span class="line">    // isOutside是否在元素之外 在监控Dom元素外是true 在里面是false</span><br><span class="line">    // target是监听的Dom元素</span><br><span class="line">    //! useMouseInElement参数都是对象 需要用.value</span><br><span class="line">    const &#123; elementX, elementY, isOutside &#125; = useMouseInElement(target)</span><br><span class="line">    // 控制左侧遮罩层 实现随鼠标移动(需要设置相应式)</span><br><span class="line">    const layerPosition = reactive(&#123; x: 0, y: 0 &#125;)</span><br><span class="line">    // 控制右侧预览图的位置 实现放大效果 (通过css样式属性 控制背景图的相对位置)</span><br><span class="line">    const imgPostion = reactive(&#123; backgroundPositionX: 0, backgroundPositionY: 0 &#125;)</span><br><span class="line">    // 设置一个监听 实时监听鼠标在图片中 位置的变化</span><br><span class="line">    watch([elementX, elementY, isOutside], (newT) =&gt; &#123;</span><br><span class="line">      // 控制显示和隐藏预览图</span><br><span class="line">      isShow.value = !isOutside.value</span><br><span class="line">      // 如果在外面就不执行预览</span><br><span class="line">      if (isOutside.value) return</span><br><span class="line">      // 计算layer(遮罩层)的位置</span><br><span class="line">      // 设置x坐标</span><br><span class="line">      if (elementX.value &lt; 100) &#123;</span><br><span class="line">        // 计算左侧的边界(x方向左边界)</span><br><span class="line">        // 到达做边界 让其固定不移出去(左上角为基准)</span><br><span class="line">        layerPosition.left = 0</span><br><span class="line">      &#125; else if (elementX.value &gt; 300) &#123;</span><br><span class="line">        // 计算右边界(x方向右边界)</span><br><span class="line">        // 到达右边界 让其固定不移出去(左上角为基准)</span><br><span class="line">        layerPosition.left = 200</span><br><span class="line">      &#125; else &#123;</span><br><span class="line">        // 临界于x轴的100和300之间</span><br><span class="line">        // 遮罩层在图片移动区域应该是300px(自身宽度的一半 -100)</span><br><span class="line">        layerPosition.left = elementX.value - 100</span><br><span class="line">      &#125;</span><br><span class="line">      // 设置y坐标</span><br><span class="line">      if (elementY.value &lt; 100) &#123;</span><br><span class="line">        // 计算左侧的边界(y方向左边界)</span><br><span class="line">        // 到达做边界 让其固定不移出去(左上角为基准)</span><br><span class="line">        layerPosition.top = 0</span><br><span class="line">      &#125; else if (elementY.value &gt; 300) &#123;</span><br><span class="line">        // 计算右边界(y方向右边界)</span><br><span class="line">        // 到达右边界 让其固定不移出去(左上角为基准)</span><br><span class="line">        layerPosition.top = 200</span><br><span class="line">      &#125; else &#123;</span><br><span class="line">        // 临界于x轴的100和300之间</span><br><span class="line">        // 遮罩层在图片移动区域应该是300px(自身宽度的一半 -100)</span><br><span class="line">        layerPosition.top = elementY.value - 100</span><br><span class="line">      &#125;</span><br><span class="line">      // 先计算 右侧大图的移动位置 再计算遮盖层的移动位置</span><br><span class="line">      // 计算右侧大图的移动位置</span><br><span class="line">      // 控制右侧大图的背景位置(右侧放大图的背景图像的水平位置)</span><br><span class="line">      // 移动的范围是之前是左侧的两倍</span><br><span class="line">      imgPostion.backgroundPositionX = -layerPosition.left * 2 + &#x27;px&#x27;</span><br><span class="line">      imgPostion.backgroundPositionY = -layerPosition.top * 2 + &#x27;px&#x27;</span><br><span class="line">      // 计算遮盖层的移动位置</span><br><span class="line">      // 算出遮盖层移动的距离 实现遮盖层根据鼠标移动 (遮盖层的背景图像的水平位置)</span><br><span class="line">      layerPosition.left = layerPosition.left + &#x27;px&#x27;</span><br><span class="line">      layerPosition.top = layerPosition.top + &#x27;px&#x27;</span><br><span class="line">    &#125;)</span><br><span class="line">    return &#123; currIndex, target, layerPosition, imgPostion, isShow &#125;</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br><span class="line">&lt;/script&gt;</span><br><span class="line">&lt;style scoped lang=&quot;less&quot;&gt;</span><br><span class="line">.goods-image &#123;</span><br><span class="line">  width: 480px;</span><br><span class="line">  height: 400px;</span><br><span class="line">  position: relative;</span><br><span class="line">  display: flex;</span><br><span class="line">  z-index: 500;</span><br><span class="line">  .large &#123;</span><br><span class="line">    position: absolute;</span><br><span class="line">    top: 0;</span><br><span class="line">    left: 412px;</span><br><span class="line">    // 设置右侧图的宽高</span><br><span class="line">    width: 400px;</span><br><span class="line">    height: 400px;</span><br><span class="line">    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);</span><br><span class="line">    background-repeat: no-repeat;</span><br><span class="line">    background-size: 800px 800px;</span><br><span class="line">    background-color: #f8f8f8;</span><br><span class="line">  &#125;</span><br><span class="line">  .middle &#123;</span><br><span class="line">    width: 400px;</span><br><span class="line">    height: 400px;</span><br><span class="line">    background: #f5f5f5;</span><br><span class="line">    position: relative;</span><br><span class="line">    cursor: move;</span><br><span class="line">    .layer &#123;</span><br><span class="line">      // 遮盖图的大小范围</span><br><span class="line">      width: 200px;</span><br><span class="line">      height: 200px;</span><br><span class="line">      background: rgba(0, 0, 0, 0.2);</span><br><span class="line">      left: 0;</span><br><span class="line">      top: 0;</span><br><span class="line">      position: absolute;</span><br><span class="line">    &#125;</span><br><span class="line">  &#125;</span><br><span class="line">  .small &#123;</span><br><span class="line">    width: 80px;</span><br><span class="line">    li &#123;</span><br><span class="line">      width: 68px;</span><br><span class="line">      height: 68px;</span><br><span class="line">      margin-left: 12px;</span><br><span class="line">      margin-bottom: 15px;</span><br><span class="line">      cursor: pointer;</span><br><span class="line">      &amp;:hover,</span><br><span class="line">      &amp;.active &#123;</span><br><span class="line">        border: 2px solid #27b79b;</span><br><span class="line">      &#125;</span><br><span class="line">    &#125;</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br><span class="line">&lt;/style&gt;</span><br><span class="line"></span><br></pre></td></tr></table></figure>

<ol start="2">
<li><p>在Vue组件中 导入图片预览放大镜组件</p>
<ul>
<li>没有设置为插件 需要<code>import</code>导入使用</li>
<li><font color =#ff3040>图片预览放大镜组件参数</font><ul>
<li><code>:images</code>动态向图片预览放大镜组件 传递展示图片数据 (必填)</li>
</ul>
</li>
</ul>
</li>
</ol>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line">&lt;template&gt;</span><br><span class="line">  &lt;div&gt;</span><br><span class="line">  &lt;!-- 使用导入图片预览放大镜组件 --&gt;</span><br><span class="line">     &lt;GoodsImage :images=&#x27;&#x27; /&gt;</span><br><span class="line">  &lt;/div&gt;</span><br><span class="line">&lt;/template&gt;</span><br><span class="line">&lt;script&gt;</span><br><span class="line">// 导入图片预览放大镜组件</span><br><span class="line">import GoodsImage from &#x27;./components/goods-image.vue&#x27;</span><br><span class="line">export default &#123;</span><br><span class="line">  name: &#x27;getImg&#x27;,</span><br><span class="line">  components: &#123;</span><br><span class="line">   // 配置图片预览放大镜组件</span><br><span class="line">    GoodsImage</span><br><span class="line">  &#125;,</span><br><span class="line">&lt;/script&gt;</span><br><span class="line"></span><br></pre></td></tr></table></figure>

<p>总结：</p>
<ol>
<li>基于Vueuse提供方法监控进入DOM内的坐标</li>
<li>基于坐标的变化控制遮罩层的移动</li>
<li>基于坐标的变化控制右侧预览图背景的变化</li>
<li>控制进入和离开时显示和隐藏效果</li>
</ol>

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